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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eede87a3cd14d6318fca7c98a439b7815483f4a1afd16a1f34b2de9ca0a3afd' 
  AND token = 'eLSW14LWQ5+YHivqk4x/XMvWqjIVaECnnKB9T4v+dps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}